It is a scene in the mind. It is an imagined scene. A dream.
It is inside of a mind. It is made of thought. It presents images but these images are only there because of imagination.
Physical matter is not fixed and is not separate from the mind that dreams it into being. Bodies, made of this matter, are similarly just images in the mind - the mind that is dreaming the world.
You could liken it, symbolically, to as if we are living inside someone's brain. Inside someone's imagination. The universe is a giant idea. A thought. Even physical matter itself is not really physical or fixed matter, it is just an imagined idea.
It is all mind. And it is all within the mind. There is no such thing as outside the mind, and ideas leave not their source.
Objects, bodies, people, cars, houses, planets, they are all just ideas in the mind. They are being held in suspension and made to seem as though they have their own personal history and a "state" of their own, but this is entirely an illusion.
All forms are being regenerated and reprojected by the mind, within the mind, every quantum of time. Each object is completely forgotten and regenerated.
The only reason that objects appears to maintain their "state" or have a "history" over time, is because the mind that is dreaming them maintains a certain belief over time, and therefore keeps re-generating an almost identical image of form.
You think objects such as your body have a history, but they do not. They are being recreated now by the mind. What they appeared to be a year ago only seems to correlate to how they appear now because the mind that is making them keeps making them in the same way, based on the same beliefs.
Your body does not have a will of its own, or a story of its own, or a history of its own, or a state of its own. It is nothing but an image coming out of a projector. The projector is running a movie and keeps projecting a similar-looking object with similar properties, to create an illusion of consistency over time. Your body now has nothing in common with your body a moment ago, at the bodily level.
This is all happening in the mind. Inside a giant mind. This entire planet and everything happening on it is just a bunch of images in a mind. Imagination. A dream of the Son of God.
When this mind changes its mind, you can bet that the dream it is imagining is going to change as well. When this mind chooses forgiveness, you can bet that the images in the mind are going to out-picture a forgiven state of being as well.
This is why miracles - as expressions of love which CURE - and as expressions of love which DEMONSTRATE that the body has not been harmed, to symbolize the fact that the mind is unharmed, MUST be expressed on the level of "form".
This world is not just some place. It is not just a physical location. It is a place in the MIND. All of the objects in it are THOUGHTS. All of the forms and all of the so-called matter is nothing but a fluidic, liquid state of mind which can change at any moment.
It is not fixed, it is not permanent, and all of its illusions of continuity are just that - an illusion, maintained by a mind which keeps on projecting the same or similar images. That does not mean the mind cannot project different images if it wants to.
Miracles then, as demonstrations that you are healed, will manifest as the so-called "body" being healed, which means that the MIND is healed. And since the body is IN the mind, the undoing of the ILLUSION of a body will make the body change. It has to.
The body is not separate from mind or outside of mind. It is made OF mind. And if the mind chooses to stop dreaming a particular part of the dream, or to dream something different, that dream - physicality - will change.
You are living in a thought-world. It is a thought-form in the mind of the Son of God. Where else could you be but in the mind that you exist in, shared with God? There is nowhere else. There is no separate place to go.
Therefore, miracles, in A Course in Miracles, must be expressed as changes to FORM - which really are changes of MIND - whereby the "personal mind" that hides in the body and the body itself as an extension of that mind, must show up in the same way.
This is why Jesus, when he ascended, saw that his body - an image of a body - was just an illusion, and that it had no real meaning, it disappeared. It disappeared WITHIN the larger mind. The mind that is dreaming the dream. He erased part of the dream, because it was nothing more than illusory images - imagination. Clearly, if a dreaming mind decides to stop dreaming, whatever it was dreaming will cease to exist. And as such the "physical body" will disappear, IN the mind, because it was always in the mind all along.
Realize this. The physical universe is made of MIND! It is made of thoughts and thinking. It is constructed by consciousness. It is entirely within the bounds of the imagination. All of the forms and objects are just images in the mind. That is why when you change your mind, when you forgive, FORM WILL CHANGE. Because mind will change.
World events, tragedies, disasters, wars, attacks, celebrations, weddings, carnivals, shows, sporting events, whatever... all of it is happening in the mind. Its all a MIND-show. Mind events. Mind choosing to create dreams. Absolutely anything is possible. The mind could even create a fantastically perfect-looking world filled with abundance and incredible creatures, if it chooses to.
And people are collectively, worldwide, constantly choosing and creating futures which comprise of all kinds of stuff happening, because they chose to believe in it. We are changing "reality" because we are changing the dream as we go along.
And this is also why certain parties attempt to manipulate global consciousness to bring about a mental manifestation of certain outcomes. (Conspiracy theory alert! lol) - they know that mind creates this world and that mind can be coerced to create preferably futures. It's all part of manipulating the dreamer.
To believe that form will not change is purely the belief that mind is limited to the body and that the body is not inside or made of the mind. And that is a very common misperception, because that's precisely what the ILLUSION shows, if you believe it.
Your car is in your mind. Your house is in your mind. Your body is in your mind. Your job is in your mind. Your family is in your mind. Your entire life is in your mind. Even the physical stuff. It's all mental. Thus, changes of MIND, changes FORM, and that is why supernatural miracles happen.
They are demonstrations of truth, that the mind that is BEHIND the form has chosen something different, defying all of the illusory laws that the IMAGES in the mind appear to follow.
And this is also why the Course's REAL definition of "miracles" is that they are SUPERNATURAL. They defy the natural laws implied by illusions and come from a mind which is dreaming the world, easily capable of changing them and producing "healed" images of bodies.
Ultimately, a completely healed mind will acknowledge that the body does not really exist at all, and that it was just a dream coming from the mind. The mind was just projecting it and making it up. And it showed up in the "world" because the world is in the mind. And then, it will cease to dream the body, and the body will disappear.
A disappeared body is the ultimate body in perfect health, because perfect divine health means freedom from illusions and forms. Thus the perfect body is disappeared into perfection and by perfection, as the ultimate HEALING of the mind that dreamed it.
The body was made to come between the mind and God, and to make it seem like the Son of God was not Himself. It must go. And its ultimate healing is its removal. Its total undoing. This is the final demonstration that you are not a body. And if you want, you could re-manifest one later to demonstrate this, just like Jesus did after the cruxifixction.
The world is just a dream in your mind. Anything goes.